1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
riadik2000 [5.3K]
3 years ago
10

All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decay

s to 100.0 g of technetium-99 in 639 000 y. What is it's half-life?
Mathematics
1 answer:
erica [24]3 years ago
3 0
The formula for A = Ao (1/2) ^ t/h
So sub in.
100 = 800 (1/2) ^ 639,000/?
That's all i can do lol

You might be interested in
In a pie chart if a value of 200 represents 80°, then 20° represents a value of
Juli2301 [7.4K]

Answer:

12

Step-by-step explanation:

12

4 0
3 years ago
Read 2 more answers
What triangle does it form ?
diamong [38]

Answer:

Scalene triangle

Step-by-step explanation:

A scalene triangle is a triangle with three different side lengths and angle measures. Since none of the side lengths are the same length, then none of the angle measures are the same either leading the correct answer to be scalene.

6 0
3 years ago
Read 2 more answers
What is the approximate volume of the sphere? Use 3.14 to approximate pi and round the answer to the nearest hundredth if necess
zvonat [6]
The answer is D. Hope this helped =)
3 0
3 years ago
Which of the following describe an angle with a vertex at E?
Marianna [84]

Answer

B., C.

Step-by-step explanation:

Since the 'E' in the middle

it represents that the angle forms at the vertex E

3 0
3 years ago
Read 2 more answers
Arrange the steps from start to finish to factor this expression using the grouping method x^2-5x-24 drag the tiles to the corre
rosijanka [135]

Answer:

(x - 8)(x + 3)

Step-by-step explanation:

x² - 5x - 24

Consider the factors of - 24 which sum to give the coefficient of the x- term (- 5)

The factors are - 8 and + 3 , since

- 8 × + 3 = - 24 and - 8 + 3 = - 5

Use these factors to split the x- term

x² - 8x + 3x - 24 ( factor the first/second and third/fourth terms )

= x(x - 8) + 3(x - 8) ← factor out (x - 8) from each term

= (x - 8)(x + 3) ← in factored form

7 0
2 years ago
Other questions:
  • Yusef earned a 25% tip on a meal that cost $75.77. What was the tip amount?
    8·2 answers
  • IN WHICH PLACE IS THE FIRST DIGIT IN THE QUOTIENT 1,497 by 5?
    12·2 answers
  • Evaluate the following expression if w = 9, x = 7, and y = 1. wx + 4
    15·2 answers
  • A jar contains 8 nickles, 10 dimes, 6 quarters, and 22 pennies. A coin in chosen at random from the jar. What is the probability
    15·1 answer
  • Emily measures the temperature of a bowl of water to be 9°C. Later she tells her friend that the water has become hot. What is t
    15·1 answer
  • A random sample of 4000 U.S. citizens yielded 2150 who are in favor of outlawing cheesing. Find the point estimate for estimatin
    7·1 answer
  • Divide. 2/7÷1/3 = pls help free points
    6·2 answers
  • Consider the following formula used to estimate the height, h, of a seeding after w weeks since planting h=(1/5)w + (8/5)which o
    15·1 answer
  • Please help me on khan academy! I promise we can be friends and talk!
    14·1 answer
  • Which function matches the graph <br><br> (absolute value)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!